Use tv as imac monitor

How to connect 27" imac to a hdtv (samaung UN55B7000) and use it as a second monitor?

Guy,
I've a done a similar connection between my TV & iMac 27" and I do get both audio and video out from the TV, when connected. I works flawlessly, when connected.
The issue I've is, when I want to watch something else on the TV, and I change the input from the HDMI to Antenna, my iMac assumes the TV is still connected and displays my secondary screen on the TV (hidden). It switches back to single display mode when I remove the connection. I tried to power off the TV (not standby), but the imac still thinks that a live displays is connected.
Do you guys keep the hdmi cable always connected.
Do anybody has similar issues like me.
Thanks & Regards
Sajid

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Use tv as imac monitor

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